<template>
  <div id="app">
    <ul v-for="(item,index) in myArr" :key="index">
      <li>{{item}}</li>
    </ul>
    <button @click="btnFn">走一走</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      myArr: ["帅哥", "美女", "程序猿"],
    };
  },
  methods: {
    btnFn(){
      let a=this.myArr[0]
      this.myArr.splice(0,1)
      this.myArr.push(a)
    }
  },
}
</script>